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In this study we assessed some exclusion criteria in the selection of skin cancer images &#40;with an emphasis on melanoma&#41; for ML analysis&#44; according to recent works in this field&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">1&#44;4&#44;5</span></a></p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Materials and Methods</span><p id="par0010" class="elsevierStylePara elsevierViewall">This study was conducted in a tertiary academic skin cancer center in Barcelona&#44; Spain&#46; A retrospective cohort study was designed including 2&#44;849 consecutive high-quality dermoscopy images of skin tumors from the Melanoma Unit database from 2010 to 2014&#46; The DermLite&#174; photo digital epiluminescence microscopy system 3Gen with 37<span class="elsevierStyleHsp" style=""></span>mm thread size and a Canon camera&#44; model G16 were used&#46; Pathological diagnosis was available for 2&#44;429 images&#46; Finally&#44; the images were assorted according to their theoretical eligibility for ML analysis&#44; pursuant to some potential exclusion criteria<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">1&#44;4&#44;5</span></a>&#58; difficulty in lesion border detection &#40;absence of pigmentation&#44; absence of normal surrounding skin&#44; presence of hair&#44; location on volar skin&#41;&#44; metastasis or an ulcerated lesion&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">This study has been approved by the institutional review board&#46; All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Results</span><p id="par0020" class="elsevierStylePara elsevierViewall">Out of the 2&#44;849 images from our database&#44; 968 &#40;34&#37;&#41; were selectable as they did not have any potential exclusion criteria for analysis by a ML system&#46; Nevi&#44; melanoma and basal cell carcinoma were the most frequent lesions in our database&#46; Only 64&#46;7&#37; of nevi and 36&#46;6&#37; of melanoma did not have any potential exclusion criteria &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Of 528 melanomas&#44; 335 &#40;63&#46;4&#37;&#41; could potentially be excluded&#46; An absence of normal surrounding skin &#40;40&#46;5&#37; of all melanomas&#41; and absence of pigmentation &#40;14&#46;2&#37;&#41; were the most common reasons for exclusion from ML analysis&#46; Other reasons for exclusion are shown in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Discussion</span><p id="par0030" class="elsevierStylePara elsevierViewall">Melanoma accounts for the majority of skin cancer deaths&#46; Early diagnosis and treatment significantly improves its prognosis&#46; The development of an effective screening method is needed and automated image classification by pattern recognition may achieve diagnostic accuracy similar to expert dermatologist&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">6</span></a> However&#44; some limitations have to be overcome&#46; One of these is the exclusion criteria in the selection of skin cancer images&#46; While solely high-quality dermoscopy images were selected from our database&#44; only 34&#37; did not have any potential exclusion criteria for classification by most state-of-the-art ML algorithms&#46; Moreover&#44; 63&#46;4&#37; of our melanomas had at least one of the potential exclusion criteria mentioned above&#46; This considerably decreases diagnostic accuracy and utility of some ML systems&#46; Large lesions are a serious problem for ML algorithms&#44; as they do not fit within the diameter of the majority of dermoscopy lenses&#44; and this renders all the state-of-the-art systems which need to pre-compute lesion segmentation&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">1</span></a> Even if some works have proposed hair detection&#47;removal methods&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">5</span></a> most ML systems&#8217; performance is deteriorated by its presence&#46; Since most dermoscopy datasets for algorithm training don&#8217;t include volar skin lesions&#44; the systems trained on these won&#8217;t be able to correctly classify acral lesions&#46; Nevertheless&#44; the artificial intelligence community is rapidly moving to overcome these nuances&#46; Yu et al&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">7</span></a> published recently a work where DCNN was used for acral melanoma and nevus classification&#46; In this work we consider the limitations of most but not all ML systems&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Our study shows that the main potential exclusion criteria were the absence of normal surrounding skin and the absence of pigmentation&#46; Many melanomas developed in sun-damaged skin with abnormal surrounding skin&#44; which makes them unsuitable for analysis by most of the current ML systems due to difficulties in lesion border detection&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">5</span></a> Moreover&#44; amelanotic melanoma which accounts for 2&#37;&#8211;8&#37; of all melanomas<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">8</span></a> cannot yet be diagnosed by most current ML systems&#46; This could be addressed by designing ML systems which are able to work with images which do not contain the entire lesion and increasing the dataset size&#44; selecting a higher number of representative dermoscopy images&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">In conclusion&#44; we consider that ML systems&#44; especially those based in the new developments in the deep learning field will not only convert ML into a valuable tool for the dermatologist but also for the general population&#46; However&#44; these systems are able to overcome some limitations to enlarge spectrum of measurable images&#46; It is clear though that researchers are moving forward towards this direction&#44; since some of the exclusion criteria mentioned in this work have already been overcome by recent algorithms included in the ISIC International Symposium&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">3</span></a></p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Funding&#47;Support</span><p id="par0045" class="elsevierStylePara elsevierViewall">The study in the Melanoma Unit&#44; Hospital Cl&#237;nic&#44; Barcelona was supported in part by grants from <span class="elsevierStyleGrantSponsor" id="gs1">Fondo de Investigaciones Sanitarias</span> P&#46;I&#46; 12&#47;00840&#44; PI15&#47;00956 and PI15&#47;00716 Spain&#59; by the <span class="elsevierStyleGrantSponsor" id="gs2">CIBER de Enfermedades Raras of the Instituto de Salud Carlos III</span>&#44; Spain&#44; co-funded by &#8220;Fondo Europeo de Desarrollo Regional &#40;FEDER&#41;&#46; Uni&#243;n Europea&#46; Una manera de hacer Europa&#8221;&#59; by the AGAUR 2014&#95;SGR&#95;603 and 2017&#95;SGR&#95;1134 of the Catalan Government&#44; Spain&#59; by a grant from &#8220;<span class="elsevierStyleGrantSponsor" id="gs3">Fundaci&#243; La Marat&#243; de TV3</span>&#44; <span class="elsevierStyleGrantNumber" refid="gs3">201331-30</span>&#8221;&#44; Catalonia&#44; Spain&#59; by the European Commission under the 6th Framework Programme&#44; Contract n&#176;&#58; LSHC-CT-2006-018702 &#40;GenoMEL&#41;&#59; by CERCA Programme&#47;Generalitat de Catalunya and by a Research Grant from &#8220;<span class="elsevierStyleGrantSponsor" id="gs4">Fundaci&#243;n Cient&#237;fica de la Asociaci&#243;n Espa&#241;ola Contra el C&#225;ncer</span>&#8221; GCB15152978SOEN&#44; Spain&#46; Part of the work was developed at the building Centro Esther Koplowitz&#44; Barcelona&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Conflicts of Interest</span><p id="par0050" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest</p></span></span>"
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            0 => "Melanoma"
            1 => "Skin cancer"
            2 => "Dermoscopy"
            3 => "Image classification"
            4 => "Machine learning"
            5 => "Artificial intelligence"
            6 => "Convolutional neural networks"
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            0 => "Melanoma"
            1 => "C&#225;ncer de piel"
            2 => "Dermatoscopia"
            3 => "Clasificaci&#243;n de im&#225;genes"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Background</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Automated image classification is a promising branch of machine learning &#40;ML&#41; useful for skin cancer diagnosis&#44; but little has been determined about its limitations for general usability in current clinical practice&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Objective</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">To determine limitations in the selection of skin cancer images for ML analysis&#44; particularly in melanoma&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Methods</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Retrospective cohort study design&#44; including 2&#44;849 consecutive high-quality dermoscopy images of skin tumors from 2010 to 2014&#44; for evaluation by a ML system&#46; Each dermoscopy image was assorted according to its eligibility for ML analysis&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Results</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Of the 2&#44;849 images chosen from our database&#44; 968 &#40;34&#37;&#41; met the inclusion criteria for analysis by the ML system&#46; Only 64&#46;7&#37; of nevi and 36&#46;6&#37; of melanoma met the inclusion criteria&#46; Of the 528 melanomas&#44; 335 &#40;63&#46;4&#37;&#41; were excluded&#46; An absence of normal surrounding skin &#40;40&#46;5&#37; of all melanomas from our database&#41; and absence of pigmentation &#40;14&#46;2&#37;&#41; were the most common reasons for exclusion from ML analysis&#46;</p></span> <span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Discussion</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Only 36&#46;6&#37; of our melanomas were admissible for analysis by state-of-the-art ML systems&#46; We conclude that future ML systems should be trained on larger datasets which include relevant non-ideal images from lesions evaluated in real clinical practice&#46; Fortunately&#44; many of these limitations are being overcome by the scientific community as recent works show&#46;</p></span>"
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            "titulo" => "Background"
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        "resumen" => "<span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Antecedentes</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">La clasificaci&#243;n autom&#225;tica de im&#225;genes es una rama prometedora del aprendizaje autom&#225;tico &#40;de sus siglas en ingl&#233;s Machine Learning &#91;ML&#93;&#41;&#44; y es una herramienta &#250;til en el diagn&#243;stico de c&#225;ncer de piel&#46; Sin embargo&#44; poco se ha estudiado acerca de las limitaciones de su uso en la pr&#225;ctica cl&#237;nica diaria&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Objetivo</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Determinar las limitaciones que existen en cuanto a la selecci&#243;n de im&#225;genes usadas para el an&#225;lisis por ML de las neoplasias cut&#225;neas&#44; en particular del melanoma&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">M&#233;todos</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Se dise&#241;&#243; un estudio de cohorte retrospectivo&#44; donde se incluyeron de forma consecutiva 2&#46;849 im&#225;genes dermatosc&#243;picas de alta calidad de tumores cut&#225;neos para su valoraci&#243;n por un sistema de ML&#44; recogidas entre los a&#241;os 2010 y 2014&#46; Cada imagen dermatosc&#243;pica fue clasificada seg&#250;n las caracter&#237;sticas de elegibilidad para el an&#225;lisis por ML&#46;</p></span> <span id="abst0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Resultados</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">De las 2&#46;849 im&#225;genes elegidas a partir de nuestra base de datos&#44; 968 &#40;34&#37;&#41; cumplieron los criterios de inclusi&#243;n&#46; De los 528 melanomas&#44; 335 &#40;63&#44;4&#37;&#41; fueron excluidos&#46; La ausencia de piel normal circundante &#40;40&#44;5&#37; de todos los melanomas de nuestra base de datos&#41; y la ausencia de pigmentaci&#243;n &#40;14&#44;2&#37;&#41; fueron las causas m&#225;s frecuentes de exclusi&#243;n para el an&#225;lisis por ML&#46;</p></span> <span id="abst0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Discusi&#243;n</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Solo el 36&#44;6&#37; de nuestros melanomas se consideraron aceptables para el an&#225;lisis por sistemas de ML de &#250;ltima generaci&#243;n&#46; Concluimos que los futuros sistemas de ML deber&#225;n ser entrenados a partir de bases de datos m&#225;s grandes que incluyan im&#225;genes representativas de la pr&#225;ctica cl&#237;nica habitual&#46; Afortunadamente&#44; muchas de estas limitaciones est&#225;n siendo superadas gracias a los avances realizados recientemente por la comunidad cient&#237;fica&#44; como se ha demostrado en trabajos recientes&#46;</p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Gonz&#225;lez-Cruz C&#44; Jofre MA&#44; Podlipnik S&#44; Combalia M&#44; Gareau D&#44; Gamboa M&#44; et al&#46; Uso del aprendizaje autom&#225;tico en el diagn&#243;stico del melanoma&#46; Limitaciones por superar&#46; Actas Dermosifiliogr&#46; 2020&#59;111&#58;313&#8211;316&#46;</p>"
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                  \t\t\t\t">&#40;62&#46;1&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Lower limbs&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#40;60&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Volar skin&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#40;100&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;0&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Trunk&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">538&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;53&#46;1&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">475&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#40;46&#46;9&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Mucosa&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#40;83&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;16&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">18&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Other&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">149&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#40;81&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;19&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="6" align="left" valign="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Basal cell carcinoma&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">295&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#40;69&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">129&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;30&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Squamous cell carcinoma&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">59&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;89&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Scar&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;77&#46;8&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">6&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#40;22&#46;2&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">27&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Dermatofibroma&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">17&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;77&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;22&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">22&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Lentigo&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">26&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;66&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">13&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;33&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">39&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="6" align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Melanoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">335&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;63&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">193&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;36&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">528&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Cutaneous metastasis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">&#40;100&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">9&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Nevus&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">256&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">470&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">726&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Actinic Keratosis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">137&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">38&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;21&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">175&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Seborrheic Keratosis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">95&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">&#40;67&#46;9&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">45&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;32&#46;1&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">140&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Other&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">225&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">&#40;82&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">48&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">273&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Pathological diagnosis NA&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">420&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">B&#46; Reasons for Exclusion</th></tr><tr title="table-row"><th class="td" title="\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">75 &#40;14&#46;2&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Absence of normal surrounding skin&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">214 &#40;40&#46;5&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Presence of hair&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">28 &#40;5&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Metastasis&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">29 &#40;5&#46;5&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Location on volar skin&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">23 &#40;4&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Ulcerated lesion&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">19 &#40;3&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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          "en" => "<p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">A&#46; Images Chosen for Analysis by ML&#46; Location and Diagnosis&#46;</p>"
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      "titulo" => "References"
      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "bibs0015"
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            0 => array:3 [
              "identificador" => "bib0045"
              "etiqueta" => "1"
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                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Digital imaging biomarkers feed machine learning for melanoma screening"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:6 [
                            0 => "D&#46;S&#46; Gareau"
                            1 => "J&#46; Correa da Rosa"
                            2 => "S&#46; Yagerman"
                            3 => "J&#46;A&#46; Carucci"
                            4 => "N&#46; Gulati"
                            5 => "F&#46; Hueto"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1111/exd.13250"
                      "Revista" => array:6 [
                        "tituloSerie" => "Exp Dermatol"
                        "fecha" => "2017"
                        "volumen" => "26"
                        "paginaInicial" => "615"
                        "paginaFinal" => "618"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/27783441"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            1 => array:3 [
              "identificador" => "bib0050"
              "etiqueta" => "2"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Deep-learning-based&#44; computer-aided classifier developed with a small dataset of clinical images surpasses board-certified dermatologists in skin tumour diagnosis"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:6 [
                            0 => "Y&#46; Fujisawa"
                            1 => "Y&#46; Otomo"
                            2 => "Y&#46; Ogata"
                            3 => "Y&#46; Nakamura"
                            4 => "R&#46; Fujita"
                            5 => "Y&#46; Ishitsuka"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1111/bjd.16924"
                      "Revista" => array:2 [
                        "tituloSerie" => "Br J Dermatol"
                        "fecha" => "2018&#46;"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            2 => array:3 [
              "identificador" => "bib0055"
              "etiqueta" => "3"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Results of the 2016 International Skin Imaging Collaboration International Symposium on Biomedical Imaging challenge&#58; comparison of the accuracy of computer algorithms to dermatologists for the diagnosis of melanoma from dermoscopic images"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:6 [
                            0 => "M&#46;A&#46; Marchetti"
                            1 => "N&#46;C&#46;F&#46; Codella"
                            2 => "S&#46;W&#46; Dusza"
                            3 => "D&#46;A&#46; Gutman"
                            4 => "B&#46; Helba"
                            5 => "A&#46; Kalloo"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1016/j.jaad.2017.08.016"
                      "Revista" => array:6 [
                        "tituloSerie" => "J Am Acad Dermatol"
                        "fecha" => "2018"
                        "volumen" => "78"
                        "paginaInicial" => "270"
                        "paginaFinal" => "277"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/28969863"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
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            3 => array:3 [
              "identificador" => "bib0060"
              "etiqueta" => "4"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "The HAM10000 dataset&#44; a large collection of multi-source dermatoscopic images of common pigmented skin lesions"
                      "autores" => array:1 [
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Original Article
Machine Learning in Melanoma Diagnosis. Limitations About to be Overcome
Uso del aprendizaje automático en el diagnóstico del melanoma. Limitaciones por superar
C. González-Cruza, M.A. Jofrea, S. Podlipnika,b, M. Combaliaa, D. Gareaud, M. Gamboaa, M.G. Vallonea, Z. Faride Barragán-Estudilloa, A.L. Tamez-Peñaa, J. Montoyaa, M. América Jesús-Silvaa, C. Carreraa,b,c, J. Malvehya,b,c, S. Puiga,b,c,
Autor para correspondencia
a Servicio de Dermatología, Hospital Clínic de Barcelona, Barcelona, Spain
b Institut d’Investigacions Biomediques August Pi I Sunyer (IDIBAPS), Barcelona, Spain
c CIBER en Enfermedades raras, Instituto de Salud Carlos III, Barcelona, Spain
d Laboratory of Investigative Dermatology, The Rockefeller University, Nueva York, USA
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        "titulo" => "Uso del aprendizaje autom&#225;tico en el diagn&#243;stico del melanoma&#46; Limitaciones por superar"
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Automated image classification by pattern recognition is a branch of machine learning &#40;ML&#41; which offers the dermatologist a useful tool for assessment in the diagnosis of skin cancer&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">1</span></a> Deep convolutional neural networks &#40;DCNN&#41; have dramatically improved accuracy in feature learning and object classification<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">2</span></a> and have been successfully used in the classification of dermoscopic images of skin lesions&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">3</span></a> However&#44; the selection of images may include certain special features which prevent its universal use at the present time&#46; In this study we assessed some exclusion criteria in the selection of skin cancer images &#40;with an emphasis on melanoma&#41; for ML analysis&#44; according to recent works in this field&#46;<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">1&#44;4&#44;5</span></a></p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Materials and Methods</span><p id="par0010" class="elsevierStylePara elsevierViewall">This study was conducted in a tertiary academic skin cancer center in Barcelona&#44; Spain&#46; A retrospective cohort study was designed including 2&#44;849 consecutive high-quality dermoscopy images of skin tumors from the Melanoma Unit database from 2010 to 2014&#46; The DermLite&#174; photo digital epiluminescence microscopy system 3Gen with 37<span class="elsevierStyleHsp" style=""></span>mm thread size and a Canon camera&#44; model G16 were used&#46; Pathological diagnosis was available for 2&#44;429 images&#46; Finally&#44; the images were assorted according to their theoretical eligibility for ML analysis&#44; pursuant to some potential exclusion criteria<a class="elsevierStyleCrossRefs" href="#bib0045"><span class="elsevierStyleSup">1&#44;4&#44;5</span></a>&#58; difficulty in lesion border detection &#40;absence of pigmentation&#44; absence of normal surrounding skin&#44; presence of hair&#44; location on volar skin&#41;&#44; metastasis or an ulcerated lesion&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">This study has been approved by the institutional review board&#46; All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards&#46;</p></span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Results</span><p id="par0020" class="elsevierStylePara elsevierViewall">Out of the 2&#44;849 images from our database&#44; 968 &#40;34&#37;&#41; were selectable as they did not have any potential exclusion criteria for analysis by a ML system&#46; Nevi&#44; melanoma and basal cell carcinoma were the most frequent lesions in our database&#46; Only 64&#46;7&#37; of nevi and 36&#46;6&#37; of melanoma did not have any potential exclusion criteria &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">Of 528 melanomas&#44; 335 &#40;63&#46;4&#37;&#41; could potentially be excluded&#46; An absence of normal surrounding skin &#40;40&#46;5&#37; of all melanomas&#41; and absence of pigmentation &#40;14&#46;2&#37;&#41; were the most common reasons for exclusion from ML analysis&#46; Other reasons for exclusion are shown in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Discussion</span><p id="par0030" class="elsevierStylePara elsevierViewall">Melanoma accounts for the majority of skin cancer deaths&#46; Early diagnosis and treatment significantly improves its prognosis&#46; The development of an effective screening method is needed and automated image classification by pattern recognition may achieve diagnostic accuracy similar to expert dermatologist&#46;<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">6</span></a> However&#44; some limitations have to be overcome&#46; One of these is the exclusion criteria in the selection of skin cancer images&#46; While solely high-quality dermoscopy images were selected from our database&#44; only 34&#37; did not have any potential exclusion criteria for classification by most state-of-the-art ML algorithms&#46; Moreover&#44; 63&#46;4&#37; of our melanomas had at least one of the potential exclusion criteria mentioned above&#46; This considerably decreases diagnostic accuracy and utility of some ML systems&#46; Large lesions are a serious problem for ML algorithms&#44; as they do not fit within the diameter of the majority of dermoscopy lenses&#44; and this renders all the state-of-the-art systems which need to pre-compute lesion segmentation&#46;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">1</span></a> Even if some works have proposed hair detection&#47;removal methods&#44;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">5</span></a> most ML systems&#8217; performance is deteriorated by its presence&#46; Since most dermoscopy datasets for algorithm training don&#8217;t include volar skin lesions&#44; the systems trained on these won&#8217;t be able to correctly classify acral lesions&#46; Nevertheless&#44; the artificial intelligence community is rapidly moving to overcome these nuances&#46; Yu et al&#46;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">7</span></a> published recently a work where DCNN was used for acral melanoma and nevus classification&#46; In this work we consider the limitations of most but not all ML systems&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">Our study shows that the main potential exclusion criteria were the absence of normal surrounding skin and the absence of pigmentation&#46; Many melanomas developed in sun-damaged skin with abnormal surrounding skin&#44; which makes them unsuitable for analysis by most of the current ML systems due to difficulties in lesion border detection&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">5</span></a> Moreover&#44; amelanotic melanoma which accounts for 2&#37;&#8211;8&#37; of all melanomas<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">8</span></a> cannot yet be diagnosed by most current ML systems&#46; This could be addressed by designing ML systems which are able to work with images which do not contain the entire lesion and increasing the dataset size&#44; selecting a higher number of representative dermoscopy images&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">In conclusion&#44; we consider that ML systems&#44; especially those based in the new developments in the deep learning field will not only convert ML into a valuable tool for the dermatologist but also for the general population&#46; However&#44; these systems are able to overcome some limitations to enlarge spectrum of measurable images&#46; It is clear though that researchers are moving forward towards this direction&#44; since some of the exclusion criteria mentioned in this work have already been overcome by recent algorithms included in the ISIC International Symposium&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">3</span></a></p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Funding&#47;Support</span><p id="par0045" class="elsevierStylePara elsevierViewall">The study in the Melanoma Unit&#44; Hospital Cl&#237;nic&#44; Barcelona was supported in part by grants from <span class="elsevierStyleGrantSponsor" id="gs1">Fondo de Investigaciones Sanitarias</span> P&#46;I&#46; 12&#47;00840&#44; PI15&#47;00956 and PI15&#47;00716 Spain&#59; by the <span class="elsevierStyleGrantSponsor" id="gs2">CIBER de Enfermedades Raras of the Instituto de Salud Carlos III</span>&#44; Spain&#44; co-funded by &#8220;Fondo Europeo de Desarrollo Regional &#40;FEDER&#41;&#46; Uni&#243;n Europea&#46; Una manera de hacer Europa&#8221;&#59; by the AGAUR 2014&#95;SGR&#95;603 and 2017&#95;SGR&#95;1134 of the Catalan Government&#44; Spain&#59; by a grant from &#8220;<span class="elsevierStyleGrantSponsor" id="gs3">Fundaci&#243; La Marat&#243; de TV3</span>&#44; <span class="elsevierStyleGrantNumber" refid="gs3">201331-30</span>&#8221;&#44; Catalonia&#44; Spain&#59; by the European Commission under the 6th Framework Programme&#44; Contract n&#176;&#58; LSHC-CT-2006-018702 &#40;GenoMEL&#41;&#59; by CERCA Programme&#47;Generalitat de Catalunya and by a Research Grant from &#8220;<span class="elsevierStyleGrantSponsor" id="gs4">Fundaci&#243;n Cient&#237;fica de la Asociaci&#243;n Espa&#241;ola Contra el C&#225;ncer</span>&#8221; GCB15152978SOEN&#44; Spain&#46; Part of the work was developed at the building Centro Esther Koplowitz&#44; Barcelona&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Conflicts of Interest</span><p id="par0050" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest</p></span></span>"
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            2 => "Dermoscopy"
            3 => "Image classification"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Background</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Automated image classification is a promising branch of machine learning &#40;ML&#41; useful for skin cancer diagnosis&#44; but little has been determined about its limitations for general usability in current clinical practice&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Objective</span><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">To determine limitations in the selection of skin cancer images for ML analysis&#44; particularly in melanoma&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Methods</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Retrospective cohort study design&#44; including 2&#44;849 consecutive high-quality dermoscopy images of skin tumors from 2010 to 2014&#44; for evaluation by a ML system&#46; Each dermoscopy image was assorted according to its eligibility for ML analysis&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Results</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Of the 2&#44;849 images chosen from our database&#44; 968 &#40;34&#37;&#41; met the inclusion criteria for analysis by the ML system&#46; Only 64&#46;7&#37; of nevi and 36&#46;6&#37; of melanoma met the inclusion criteria&#46; Of the 528 melanomas&#44; 335 &#40;63&#46;4&#37;&#41; were excluded&#46; An absence of normal surrounding skin &#40;40&#46;5&#37; of all melanomas from our database&#41; and absence of pigmentation &#40;14&#46;2&#37;&#41; were the most common reasons for exclusion from ML analysis&#46;</p></span> <span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0030">Discussion</span><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">Only 36&#46;6&#37; of our melanomas were admissible for analysis by state-of-the-art ML systems&#46; We conclude that future ML systems should be trained on larger datasets which include relevant non-ideal images from lesions evaluated in real clinical practice&#46; Fortunately&#44; many of these limitations are being overcome by the scientific community as recent works show&#46;</p></span>"
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        "resumen" => "<span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Antecedentes</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">La clasificaci&#243;n autom&#225;tica de im&#225;genes es una rama prometedora del aprendizaje autom&#225;tico &#40;de sus siglas en ingl&#233;s Machine Learning &#91;ML&#93;&#41;&#44; y es una herramienta &#250;til en el diagn&#243;stico de c&#225;ncer de piel&#46; Sin embargo&#44; poco se ha estudiado acerca de las limitaciones de su uso en la pr&#225;ctica cl&#237;nica diaria&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Objetivo</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Determinar las limitaciones que existen en cuanto a la selecci&#243;n de im&#225;genes usadas para el an&#225;lisis por ML de las neoplasias cut&#225;neas&#44; en particular del melanoma&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">M&#233;todos</span><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Se dise&#241;&#243; un estudio de cohorte retrospectivo&#44; donde se incluyeron de forma consecutiva 2&#46;849 im&#225;genes dermatosc&#243;picas de alta calidad de tumores cut&#225;neos para su valoraci&#243;n por un sistema de ML&#44; recogidas entre los a&#241;os 2010 y 2014&#46; Cada imagen dermatosc&#243;pica fue clasificada seg&#250;n las caracter&#237;sticas de elegibilidad para el an&#225;lisis por ML&#46;</p></span> <span id="abst0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0055">Resultados</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">De las 2&#46;849 im&#225;genes elegidas a partir de nuestra base de datos&#44; 968 &#40;34&#37;&#41; cumplieron los criterios de inclusi&#243;n&#46; De los 528 melanomas&#44; 335 &#40;63&#44;4&#37;&#41; fueron excluidos&#46; La ausencia de piel normal circundante &#40;40&#44;5&#37; de todos los melanomas de nuestra base de datos&#41; y la ausencia de pigmentaci&#243;n &#40;14&#44;2&#37;&#41; fueron las causas m&#225;s frecuentes de exclusi&#243;n para el an&#225;lisis por ML&#46;</p></span> <span id="abst0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0060">Discusi&#243;n</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">Solo el 36&#44;6&#37; de nuestros melanomas se consideraron aceptables para el an&#225;lisis por sistemas de ML de &#250;ltima generaci&#243;n&#46; Concluimos que los futuros sistemas de ML deber&#225;n ser entrenados a partir de bases de datos m&#225;s grandes que incluyan im&#225;genes representativas de la pr&#225;ctica cl&#237;nica habitual&#46; Afortunadamente&#44; muchas de estas limitaciones est&#225;n siendo superadas gracias a los avances realizados recientemente por la comunidad cient&#237;fica&#44; como se ha demostrado en trabajos recientes&#46;</p></span>"
        "secciones" => array:5 [
          0 => array:2 [
            "identificador" => "abst0030"
            "titulo" => "Antecedentes"
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          1 => array:2 [
            "identificador" => "abst0035"
            "titulo" => "Objetivo"
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          2 => array:2 [
            "identificador" => "abst0040"
            "titulo" => "M&#233;todos"
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          3 => array:2 [
            "identificador" => "abst0045"
            "titulo" => "Resultados"
          ]
          4 => array:2 [
            "identificador" => "abst0050"
            "titulo" => "Discusi&#243;n"
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    "NotaPie" => array:1 [
      0 => array:2 [
        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Gonz&#225;lez-Cruz C&#44; Jofre MA&#44; Podlipnik S&#44; Combalia M&#44; Gareau D&#44; Gamboa M&#44; et al&#46; Uso del aprendizaje autom&#225;tico en el diagn&#243;stico del melanoma&#46; Limitaciones por superar&#46; Actas Dermosifiliogr&#46; 2020&#59;111&#58;313&#8211;316&#46;</p>"
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          0 => array:3 [
            "identificador" => "at1"
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Had Any Potential Exclusion Criteria &#40;&#37; From Total by Location or Diagnosis&#41;</th><th class="td" title="\n
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                  \t\t\t\t">159&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">97&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">256&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Lower limbs&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">297&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">195&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;39&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">492&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Volar skin&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;0&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">62&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Trunk&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">538&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">&#40;53&#46;1&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">475&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;46&#46;9&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1013&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="left" valign="\n
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                  \t\t\t\t">15&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">&#40;83&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">3&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">&#40;16&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">18&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Other&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">149&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;81&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">35&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;19&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">184&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="6" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="6" align="left" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">295&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">129&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;30&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Squamous cell carcinoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">59&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;89&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">7&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;10&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">66&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Scar&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">21&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;77&#46;8&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">6&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;22&#46;2&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">27&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Dermatofibroma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">17&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;77&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;22&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">22&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Lentigo&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">26&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;66&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">13&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;33&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">39&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="6" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleVsp" style="height:0.5px"></span></td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Melanoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">335&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;63&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">193&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;36&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">528&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Cutaneous metastasis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;100&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Nevus&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">256&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;35&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">470&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;64&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">726&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Actinic Keratosis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">137&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;78&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">38&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;21&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">175&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Seborrheic Keratosis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">95&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;67&#46;9&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">45&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;32&#46;1&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">140&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Other&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">225&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;82&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">48&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#40;17&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">273&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Pathological diagnosis NA&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">&#8211;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">420&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
              "imagenFichero" => array:1 [
                0 => "xTab2307222.png"
              ]
            ]
            1 => array:2 [
              "tabla" => array:1 [
                0 => """
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                  \t\t\t\t\tvoid\n
                  \t\t\t\t" class=""><thead title="thead"><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " colspan="2" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">B&#46; Reasons for Exclusion</th></tr><tr title="table-row"><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Melanoma&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th><th class="td" title="\n
                  \t\t\t\t\ttable-head\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Number of Excluded &#40;&#37; From Total Melanoma&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t\t\t</th></tr></thead><tbody title="tbody"><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="2" align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">Reasons for exclusion</span></td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Absence of pigmentation&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">75 &#40;14&#46;2&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Absence of normal surrounding skin&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">214 &#40;40&#46;5&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Presence of hair&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">28 &#40;5&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Metastasis&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">29 &#40;5&#46;5&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Location on volar skin&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">23 &#40;4&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Ulcerated lesion&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">19 &#40;3&#46;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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        "titulo" => "Acknowledgements"
        "texto" => "<p id="par0055" class="elsevierStylePara elsevierViewall">Thanks to our patients and their families who are the main reason for our studies&#59; to nurses from the Melanoma Unit of Hospital Cl&#237;nic of Barcelona&#44; Daniel Gabriel&#44; Pablo Iglesias and Maria E Moliner for helping to collect patient data and to Paul Hetherington for helping with English editing and correction of the manuscript&#46;</p>"
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